chore: subject docs/*.md to Prettier checks (#4645)

Apparently we were not running our `pnpm run prettier` check in CI, so
many files that were covered by the existing Prettier check were not
well-formatted.

This updates CI and formats the files.

.github/workflows/issue-labeler.yml

@@ -43,17 +43,17 @@ jobs:
             10. model-behavior — Undesirable LLM behavior: forgetting goals, refusing work, hallucinating environment details, quota misreports, or other reasoning/performance anomalies.
 
             Issue number: ${{ github.event.issue.number }}
-            
+
             Issue title:
             ${{ github.event.issue.title }}
-            
+
             Issue body:
             ${{ github.event.issue.body }}
-            
+
             Repository full name:
             ${{ github.repository }}
 
-          output_schema: | 
+          output_schema: |
             {
               "type": "object",
               "properties": {